Method for operating a gas heater

A method for operating a gas heater for providing central heating and/or for providing domestic hot water, the method comprising:

• supplying a gas and a fuel gas into a mixing chamber of the gas heater and supplying a mixed gas from the mixing chamber to a burner of the gas heater;
• measuring a differential pressure per unit time and/or providing a sensor signal to a control unit for determining a gas quantity, defined by a volume per unit time or a mass per unit time, before the gas is supplied to the mixing chamber;
• measuring the differential pressure per unit time and/or providing a sensor signal to the control unit for determining a fuel gas quantity, defined by a volume per unit time or a mass per unit time, before the fuel gas is supplied to the mixing chamber;
• and
• determining whether at least one operation condition of the gas heater is fulfilled based on the determined gas quantity and/or the determined fuel gas quantity.

A gas heater comprising:

• a mixing chamber for mixing gas and fuel gas;
• a burner that is arranged downstream from the mixing chamber and to which a mixed gas of the mixing chamber can be supplied;
• a control unit that is adapted to determine whether at least one operation condition of the gas heater is fulfilled based on a determined gas quantity and/or a determined fuel gas quantity;
• a first sensor for measuring a differential pressure per unit time and/or for providing a sensor signal to the control unit for determining the gas quantity, defined by a volume per unit or a mass per unit time, of the gas to be supplied into the mixing chamber;
• and
• a second sensor for measuring the differential pressure per unit time and/or for providing a sensor signal to the control unit for determining the fuel gas quantity, defined by a volume per unit time or a mass per unit time, of the fuel gas to be supplied into the mixing chamber.